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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/**
+ * nsISessionStore keeps track of the current browsing state - i.e.
+ * tab history, cookies, scroll state, form data, and window features
+ * - and allows to restore everything into one window.
+ */
+
+[scriptable, uuid(934697e4-3807-47f8-b6c9-6caa8d83ccd1)]
+interface nsISessionStartup: nsISupports
+{
+ /**
+ * Return a promise that is resolved once initialization
+ * is complete.
+ */
+ readonly attribute jsval onceInitialized;
+
+ // Get session state
+ readonly attribute jsval state;
+
+ /**
+ * Determines whether there is a pending session restore. Should only be
+ * called after initialization has completed.
+ */
+ boolean doRestore();
+
+ /**
+ * Determines whether automatic session restoration is enabled for this
+ * launch of the browser. This does not include crash restoration, and will
+ * return false if restoration will only be caused by a crash.
+ */
+ boolean isAutomaticRestoreEnabled();
+
+ /**
+ * Returns whether we will restore a session that ends up replacing the
+ * homepage. The browser uses this to not start loading the homepage if
+ * we're going to stop its load anyway shortly after.
+ *
+ * This is meant to be an optimization for the average case that loading the
+ * session file finishes before we may want to start loading the default
+ * homepage. Should this be called before the session file has been read it
+ * will just return false.
+ */
+ readonly attribute bool willOverrideHomepage;
+
+ /**
+ * What type of session we're restoring.
+ * NO_SESSION There is no data available from the previous session
+ * RECOVER_SESSION The last session crashed. It will either be restored or
+ * about:sessionrestore will be shown.
+ * RESUME_SESSION The previous session should be restored at startup
+ * DEFER_SESSION The previous session is fine, but it shouldn't be restored
+ * without explicit action (with the exception of pinned tabs)
+ */
+ const unsigned long NO_SESSION = 0;
+ const unsigned long RECOVER_SESSION = 1;
+ const unsigned long RESUME_SESSION = 2;
+ const unsigned long DEFER_SESSION = 3;
+
+ readonly attribute unsigned long sessionType;
+ readonly attribute bool previousSessionCrashed;
+};